Lines A,B,C,D, and E all pass through the point (3, 6). Line A also passes through (7, 12); line B passes through (8, 4); line C passes through (-1, -3); line D passes through (1, 1); and line E passes through (6, 12).
Are any of these lines perpendicular? If so, which ones? If not, why not?
Are any of these lines parallel? If so, which ones? If not, why not?
